Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) - Manual (Page 279)

Brocade Virtual ADX Switch and Router Guide 265
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The third and fourth commands configure a second route map that explicitly enables dampening.
Notice that the route map does not contain a match clause. The route map implicitly applies to all
routes. Since the route map will be applied to a neighbor at the BGP4 configuration level, the route
map will apply to all routes associated with the neighbor.
Although the second route map enables dampening, the first route map is still required. The
second route map enables dampening for the neighbors to which the route map is applied.
However, unless dampening is already enabled globally by the first route map, the second route
map has no effect.
The last two commands apply the route maps. The dampening route-map command applies the
first route map, which enables dampening globally. The neighbor command applies the second
route map to neighbor 10.10.10.1. Since the second route map does not contain match clauses for
specific routes, the route map enables dampening for all routes received from the neighbor.
Removing route damping from a route
You can un-suppress routes by removing route flap damping from the routes. The device allows you
to un-suppress all routes at once or un-suppress individual routes.
To un-suppress all the suppressed routes, enter the following command at the Privileged EXEC level
of the CLI.
Virtual ADX# clear ip bgp dampening
Syntax: clear ip bgp dampening [ip-addr ip-mask]
The ip-addr parameter specifies a particular network.
The ip-mask parameter specifies the network’s mask.
To un-suppress a specific route, enter a command such as the following.
Virtual ADX# clear ip bgp dampening 10.157.22.0 255.255.255.0
This command un-suppresses only the routes for network 10.157.22.0/24.
Displaying and clearing route flap dampening statistics
The software provides many options for displaying and clearing route flap statistics.
Displaying route flap dampening statistics
To display route dampening statistics or all the dampened routes, enter the following command at
any CLI level.
Virtual ADX# show ip bgp flap-statistics
Total number of flapping routes: 414
Status Code >:best d:damped h:history *:valid
Network From Flaps Since Reuse Path
h> 10.50.206.0/23 10.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 701
h> 10.255.192.0/20 10.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 7018
h> 10.252.165.0/24 10.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 7018
h> 10.50.208.0/23 10.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 701
h> 10.33.0.0/16 10.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 701
*> 10.17.220.0/24 10.90.213.77 1 0 :1 :4 0 :0 :0 65001 4355 701 62